Differential gear.



No- 808,002. PATENTED DEC. 19, 1905. R. H.BROCKMAN.

DIFFERENTIAL GEAR APPLICATION FILED JULY 27.1904.

ATTORNEYS wl llilllu lm WITNESSES. WC MA nnrrn STATES PATENT orrrcn.

ROBERT H. BROCKMAN, OF NEW YORK, N. Y.

DIFFERENTIAL GEAR.

To rtZZ whmn it nan/y concern:

Be it known that 1, ROBERT H. BRooKnAN, a citizen of the United States,and a resident of the city of ew York, borough of Manhattan, in thecounty and State of New York, have invented a new and ImprovedDifferential Gear, of which the following is a full, clear, and exactdescription.

The invention relates to gearing by means of which twoindependently-revoluble members may be uniformly driven and at the sametime allowed a differential turning movement.

The invention is especially adapted for motor-vehicles, but maybe usedin other con nections.

The invention resides primarily in the con nection of the driving memberwith the driven members through the medium of a belt ascontradistinguished from the toothed gears hereinbefore employed.Preferably this belt is of the chain type and coaets with sprocketsmounted on the driving and driven members.

Reference is to be had to the accompanying drawings, which show as anexample the preferred embodiment of my invention, in which drawings likeletters of reference indicate like parts in the several views.

Figure 1 is a side elevation of the gear, and Fig. 2 is a longitudinalsection thereof on the line 2 2 of Fig. 1.

a indicates the supporting shaft or axle, and 1) indicates sleeves ortubular shafts turning freely on the central shaft 0, the tubularshaft 1) in case the invention is applied to a motor-vehicle being inconnection, respectively, with the driving or road wheel thereof.

0 indicates the driving member of the gear, which is here shown as asprocket and is mounted to turn freely on the shaft a between thesleeves b. Said driving member 0 has orifices c therein, and in saidorifices are suitably mounted sprocket-wheels d, which turn freely inthe orifices c and carry a peculiar endless sprocket-chain whichalsopasses around sprockets e, keyed or otherwise fastened to thesleeves b. Uponimparting a driving movement to the members 0 the wheels(i will move bodily with said member, carrying with it the chain, whichin turn will .cause the sprockets e and the sleeves to which saidsprockets are fastened to run, drivmg the sleeves as a unit from thedriving member 0. Tlns arrangement allows an 1n- Speeification ofLetters Patent.

Application filerl illy 27,1904. Serial No. 218,360.

Patented Dec. 19, 1905.

dependent rotative movement of the sleeves, in which case thesprocket-chain has a running movement, also resulting in an independentturning movement of the wheels (1 around their axis in the drivingmember or wheel 0.

The belt or chain connecting the wheels cl and e, as here shown, isformed of blocks f,

through which pins f pass at right angles.-

These pins are respectively connected with links f which lie in pairs,the members of which are situated, respectively, at the sides of theblocks. The chain therefore is made up of links and blocks connected bytwo sets of pivot-pins, the pivots of one set crossing the axes of thepivots of the other set, thus allowing the chain to turn aroundsprocketwheels arranged on axes at right or other angles to each other.

Various changes in the form, proportions, and minor details of myinvention may be resorted to without departing from the spirit and scopethereof. ll considermyselfentitled to all such variations as may liewithin the scope of my claims.

Having thus described my invention, I claim as new and desire to secureby Letters Patent 1. The combination of two driven members, a beltconnecting the two, a member engaged with the belt intermediate thedriven members, and a gear-wheel adapted to receive a driving movement,the gear-wheel having an orifice therein in which the lastnamed memberis loosely mounted.

2. The combination of two driven members, an endless belt connecting thetwo, two

gaged with the .belt is loosely mounted.

4. The combination of two driven members, a wheel attached to each, anendless chain engaged with said wheels, additional wheels engaged withthe endless chain between the two wheels first named, and adriving-wheel having orifices therein in which said additional wheelsare loosely mounted, first named and serving to support the sec- 10 saiddriving-wheel being located intermediond-named wheels. ate or betweenthe two first-named wheels. In testimony whereof I have signed my 5. Thecombination of two driven mem- I name to this specification in thepresence of 5 bers, a wheel attached to each member, said twosubscribing witnesses.

wheels being spaced apart, an endless belt ROBERT H. BROCKMAN. engagedwith the wheels, additional wheels Witnesses: engaged with the endlessbelt, and a driving- J NO. M. BITTER,

wheel located intermediate the two wheels ISAAC B. OWENS.

